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发明名称
Perfectionnements aux indicateurs visuels pour appareils de sondage par l'écho
摘要
申请公布号
FR809219(A)
申请公布日期
1937.02.26
申请号
FRD809219
申请日期
1936.07.24
申请人
HENRY HUGHES & SON, LIMITED
发明人
SPROULE DONALD ORR
分类号
G01S1/72
主分类号
G01S1/72
代理机构
代理人
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地址
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